Wow I think he's right. I would love to have that much to spend!
I have a budget of £45 a week max for groceries, that's food, toiletries and cleaning products. That's for me and 1 ds (aged 9). My son has packed lunches (no free school dinners) so it includes that. I consider that a pretty good budget, when i was on income support the budget was £30 a week.
In addition i have an 'other' budget which i dip into for additional grocery extra's like birthday cake, easter eggs etc. But it also has to cover all my additional extras like school trips, outings (swimming, zoo, cinema), clothes, school uniform, scout subs, evenings out for me (which i don't have), dvd's.... basically anything else we want to buy which isn't stictly a necessity. So there isn't much left to spend on extra groceries in reality. That budget is £75 a month so £17 a week possible extra.
I wouldn't say it's a decent amount, but we get by and since the budget went up from £30 to £45 a week (now i'm working) we can afford a more varied variety of fruit and veg, which is usually half of the budget to be honest. Plus we're vegi so don't spend money on meat, though vegoi substitutes like sausages are more expensive than meat by and large!
We eat a very basic diet, mostly pasta, am always looking out for the bogof deals and don't have a lot of luxuries and i never buy alcohol. I also can't afford to have friends over for a meal (mine or his), and we rarely have biscuits or treat tyoe foods in the hous. So depending on what you are used to buying and what you consider to be 'grocery' shopping your spending might be different.
Analyse you shopping bill out, work out what you're spending things on and where you can make savings. What are necessities and which are luxuries. Can you buy ownbrand instead of branded maybe. Then you can show him why you think £x is reasonable and also show yourself where that money goes. If your DS is in nappies still for example then you're going to be spending out on those.
Gilly